Similar results were obtained for PFS: seven studies that included 616 patients revealed that high levels of sPD-L1 correlated with unfavorable survival in the NSCLC group with an HR = 2.18 (95%CI: 1.27–3.76, p < 0.01, I2 = 88%, Figure 5). Here, SPDL1 is linked to non-small cell lung carcinoma.